Angle attachment for dental handpieces.



PATENTED NOV. 12, 1907..

J. P. HARDY. ANGLE ATTACHMENT FOR DENTAL HANDPIBGBS.

APPLIOATION FILED AUG. 29, 1906.

Eg /Z1211 UNITED STATES PATENT OFFICE.

JAMES F. HARDY, or NEW YORK, N. Y.,

ASSIGNOR TO CONSOLIDATED DENTAL MANUFACTURING COMPANY, OF NEW YORK, N.Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Nov. 12, 1907.

Application filed August 29. 1906. Serial K013324 10.

To all whom it may concern:

Be it known that I, JAMES F. HARDY, a citizen of the United States, andresident of the borough of Manhat' tan, in the city and State of NewYork, have invented a new and useful Improvement in Angle Attachmentsfor Dental Handpieces, of which the following is a specification.

My invention relates to angle attachments for dental hand pieces withthe object in view of providing means for readily removing the tool fromand adjusting it in its operative position, for cleansing or for thesubstitution of a different tool.

In the accompanying drawings, Figure 1 is a view of the attachment inside elevation with tool in position for use; Fig. 2 is a view of thesame in longitudinal section, Fig. 3 is a longitudinal section with toolremoved, Fig. 4 is a sectional view in detail of the tool support, Fig.5 is an end view of'the same, -Fig. 6 is a top plan view of the same,Fig. 7 is a sectional view of the tool operating sleeve, showing a toolin position therein, Fig. 8 is a similar view with tool removed, Fig. 9is a top plan view of the same, Fig. 10 is a view of the tool in detail,Fig. 11 is a top plan view of the same, Fig. 12 is a top plan view ofthe tool retaining dog, Fig. 13 is a bottom plan view of the same, andFig. 14 is an end view of the same.

The hand piece denoted by 1 supports the tool driving spindle 2 in theusual manner. On to the end of the hand piece the tool support 3 isscrewed by means of an internally screw-threaded socket piece 4. Atransverse socket piece 5 in the tool support 3 receives the tooldriving sleeve 6, the latter being provided with a pinion 7 and anannular bead 8. The annular bead 8 serves as an external bearing for thesleeve and also projects throughout a portion of its extent into theborein the sleeve as shown at 9, to lock the tool against rotationtherein. Thesleeve 6 is held in the socket 5 by means of a tubular nut10 which screws into the end of the socket and bears against the side ofthe pinion 7. The tool driving spindle 2 is provided with a pinion 11which intermeshes with the pinion 7 when the parts are in operativeadjustment.

In the top of the support 3, immediately above the socket piece 4, thereis formed on the inner face of the support, a groove 12 extending alongboth sides and across the end of the support. In this groove or thesegrooves the tool retaining dog 13 slides, a slot 14 in the end of thedog receiving and embracing the opposite sides of the neck 15 of thetool. The neck 15 of the tool, when the tool is in position in thesleeve 6, projects above the top of the sleeve as clearly shown in Figs.2 and 7, and above the neck 15 the tool is provided with an enlargedhead 16 of greater diameter than the middle of the slot 14 in the toolretaining dog. The body 17 of the cutter is intended to have a closesliding lit with the interior bore of the sleeve 6, and the said body iscut away at 18 in proximity to the neck 15 to receive the internalprojection 9 on the sleeve to lock the tool against rotation.

The dog 13 has fixed to its outer face a finger piece 19 for operatingit and a flat retaining spring 20, the latter being provided at its endwith a short depression 21 in position to seat against the projectingshould er 22 on the hand piece when the dog is in locking adjustment asshown in Figs. 1 and 2. The depressed'portion 21 of the spring ispreferably given a curved form as shown, so that it may be forced backover the shoulder 22 by a forcible push on the finger piece 19 but willat the same time hold the dog in locking position against unintentionalmisplacement.

The structure is simple and effective and admits of quickly removing thetool by simply sliding the dog back while the tool sleex e itself may beremoved by simply unscrewing the nut 10.

What I claim is- 1. The combination with suitable tool supportingmechanism and tool driving mechanism, of a tool retaining dog seated onsaid support to be moved toward and away from the tool along the toolsupport, said dog having an integral spring portion at its free end inposition to engage the tool support to hold the locking dog in lockingadjustment.

2. The combination with a hand piece containing a tool driving spindleand a tool support, of a tool holding sleeve removably seated in thetool support in position to be rotated by the tool operating spindle,the tool shank and the sleeve being provided with flattened engagingsurfaces to prevent the tool from rotating relative to the sleeve, 21dog slidably seated in the tool support and constructed to engage thetool and hold it against longitudinal displacement with its flattenedsurface in engagement with the flattened surface of the sleeve andhaving an integral spring portion adapted to engage the tool support forlocking the dog in its holding position.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two witnesses, this 22nd day of August 1906.

JAMES F. HARDY.

Witnesses H. D. BEEL'IMAN, .Lmns MURRAY.

